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Cause Troubleshooting method 1. Dirty spark plug or incorrect clearance 1. Clean the spark plug and reset the 2. Dirty fuel system 2. Clean the fuel system and replace the 3. Burned, bent or dented valve 3. Replace the valve 4. Ignition coil troble 4. Test and replace if necessary (see Cause Troubleshooting method 1. Dirty spark plug or incorrect clearance 1. Clean the spark plug and reset the 2. Ignition coil troble 2. Test and replace if necessary (see 3. Dirty spray nozzle 3. Test and replace if necessary (see 4. Dirty fuel system 4. Clean the fuel system and replace the Cause Troubleshooting method 1. Incorrect engine oil level in 1. Check and correct engine oil quantity 2. Incorrect engine oil viscosity 2. Choose the engine oil of proper viscosity 3. Low engine oil viscosity 3. (a) Replace the engine oil and filter (b) Run the engine to normal working conditions 4. Engine oil under pressure 4. Check and correct the engine oil level 5. Dirty tappet 5. Replace the rocker arm and hydraulic tappet 6. Worn-out rocker arm 6. Check the oil supply circuit of the rocker arm 7. Overused tappet 7. Fix new rocker arm and hydraulic tappet assembly 8. Worn-out valve conduit 8. Replace the cylinder cover 9. Worn-out valve seat 9. Grind the valve or replace the cylinder cover 10. Failing rocker arm adjustor 10. Replace the rocker arm/hydraulic tappet assembly
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